 Battery charging without ALT light, What’s going on? |
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| VaccaRabite |
 Sep 30 2026, 02:06 PM
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En Garde!  Group: Admin Posts: 13,921 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region 
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A friend of mine had his battery pop in his 914. Battery acid everywhere. We got it running last weekend after a year of sitting.
Of note, the alternator light never turns on. BUT, the car is charging the battery at 13.9 volts. How is this possible? My guess is that he has a damaged or failing diode in the alternator, but I thought the battery COULD not charge without the alternator light turning on. So I’m confused. Thanks Zach |
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| Artfrombama |
Sep 30 2026, 03:38 PM
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Artfrombama Group: Members Posts: 485 Joined: 21-January 24 From: One of the chosen few Member No.: 27,870 Region Association: South East States
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If you have an old battery that never fully charges, the alternator will continue to try to charge resulting in gassing and the potential to explode.
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Posts in this topic
VaccaRabite Battery charging without ALT light Sep 30 2026, 02:06 PM
VaccaRabite Battery didn’t explode persey. But it did spray ... Sep 30 2026, 04:41 PM SirAndy Wait, i'm confused. The alternator light is su... Sep 30 2026, 04:45 PM
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Wait, i'm confused. The alternator light is ... Sep 30 2026, 11:34 PM 930cabman Please clarify, how/why would a battery pop or spr... Sep 30 2026, 04:51 PM VaccaRabite Not my car and I’m currently 100ish miles from i... Sep 30 2026, 05:02 PM |
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